Voters feeling All Shook Up after six weeks of heavy electioneering were offered some light relief yesterday - by the King of rock 'n' roll.

Elvis Presley-lookalike Bobby Day, from Witham, Essex, made a surprise appearance outside Conservative Central Office before the Prime Minister's news conference. He was there to launch the Elvis Presley Party's manifesto, promising happiness and pleasure to voters turned off by the ''dull, stage-managed'' campaign of the major parties. Behind the scheme is party chairman and leader Sid Shaw, who recently won a High Court battle with America's Elvis Presley industry over the right to sell novelty goods commemorating the star in Britain.

While the Tories traded blows with Labour over tax and pensions policy, the Elvis Presley Party is urging a ''sleazeometer'' for MPs, which blasts out You Ain't Nothing But A Hound Dog for those who register positive.

The manifesto calls for the National Anthem to be replaced by Elvis's If I Can Dream and for all late-night parliamentary sittings to be punctuated with a one-hour Elvis karaoke slot.

It urges voters not to put a cross by one of the ''boring candidates'''' on ballot papers, but just write ''Elvis'' on the top.